First slide

Cell

Question

To get the maximum current from a parallel combination of n identical cells each of internal resistance r in an external resistance R, the relation between R and r is

Easy

A

R >> r
B

R << r
C

R = r
D

None of these

Solution

Cells are joined in parallel when internal resistance is higher than an external resistance. (R << r)
$i = \frac{E}{R + \frac{r}{n}}$

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